π Statistics & Probability
CSV to JSON Converter
Convert CSV to JSON instantly in your browser. Free CSV to JSON converter with custom delimiter support.
What This Calculator Tells You
This converter turns CSV data into a JSON array of objects, using the first row as field names. It is handy when you need to load spreadsheet data into a web app, an API request, a no-code tool or a test fixture.
Conversion runs in your browser, so customer or financial data never leaves your computer.
What to Enter
- Paste CSV (first row = headers) β the header row becomes the keys; each following row becomes one object.
- Delimiter β comma by default. Use ; for European-style exports or | for pipe-separated files.
Worked Examples
1. A simple contact list
Three lines: name,age,city / Ada,30,NYC / Bob,25,LA.
- Output: 2 rows, starting with {"name": "Ada", "age": "30", "city": "NYC"}.
2. A semicolon export
A CSV exported from European Excel uses ; between fields.
- Set the delimiter to ; and the fields split correctly.
3. Seeding a test database
Export a sheet of sample products and convert it.
- Paste the JSON into your fixture file, then change numeric fields to numbers if your code needs them.
How to Read Your Result
- Rows is the number of data rows converted (the header row is not counted).
- All values are output as text strings, the safest default. Convert numbers or booleans in your code if needed.
- Missing cells become empty strings, so every object has the same keys.
Common Mistakes to Avoid
- Commas inside values. This tool splits on every delimiter and does not parse quoted fields, so a value like Austin, TX would split in two. Save the file with a different delimiter (such as |) first.
- Duplicate header names β later columns overwrite earlier ones with the same key.
- A blank first line, which would be read as the header row.
- Very large files β for hundreds of thousands of rows, use a script or command-line tool.
When to Use This Calculator
- Turn spreadsheet data into JSON for APIs and web apps.
- Create test fixtures and seed data.
- Move data into no-code tools that accept JSON.
- Inspect CSV structure in a readable format.
Frequently Asked Questions
Is my data uploaded?
No. The conversion runs entirely in your browser.
Why are numbers in quotes?
Values are kept as strings so nothing is silently changed (for example, ZIP codes with leading zeros). Convert types in your own code.
Does it handle quoted fields?
No β it is a fast, simple splitter. Use a delimiter that does not appear in your data.
Can I validate the JSON?
Yes, paste the output into the JSON formatter.
Do you store the values I enter?
No. All calculations happen in your browser. Your data never leaves your device.
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